Spark-plug.



SPARK PLUG.

AYPLIGATION YlLnD Dsc 26.1913.

N. J. HOAG & H. E. VOSBURGH.

W/ T/VESSITS f XVM To all 'whom .it may cocern UNiTED STATES PATENLOEFICE;

.Nomix T. HoAG im HENnY'nNosBURGH, oF SKANEATELES, Naw Yoaxg sain" vosnnaan `assmrron, croma-THIRD 'ro SAID noaa. v

SPARK-PLUG.

Be ,itfknow'n .that "we, NORMAN J. HQAG 'and HENRY Yosnmq'rr, citizens of the United States, residing at Skaneateles, in the county of Onondaga and'State of New York, have invented certain newA and usefull Im rove-V ments in Spark-Plugs, of `whilq the ollowinglis a specification.

Y his inventionrelates .to sparking or ignitingiplugs f or use jn connection with' internal combustion-engines'for electrically igniting ,the explosive gases the engine cy inders, and has or'its objectto rov1de novel, simple and -efiectiye means or preventing :the accumulation `of oil, soot, or carbon in Athe neighborhood of the'sparlringpoints.

A further :and vparticular objectisto provide .a coiled heating clement .between the .outer or shell and lthe central conductor ter inning the .il- .or .-Smke .after each Veirplosion, a nd thus preyentthe .accumulatonfsoot or carbon, which frequently trated in Fig.

'curing the .coiled .heater in plae. I-

;the insulating fenve causesth'e shQrt-circuitingof many of :the

01d Styles Of. Plugs ,And a .further object is to provide novel andsimple Jneans'iorse'- *In the-accompanying drawing, Figure -l is an .elevational view of thecomplete plug; showing the heating trode. E ig. 2 is a cental longitudinal section of the same. Fig. 3 is a similar sectional view; vshowing .certain modifications Fig-4 is a. brok, el .v fationbf the plug illusl gsho ing thespiral groove in,the insulation to receive .the .heatin coil. Fig. 5 is a bottom end-view .of .thep ug .of Fig. 1. Eig. 6 is asimilar view of Ithe plug shown in Fig. 3. Fig, 7 is :a broken eleva- .tionfof the same :with the coil omitted. Fig. 8 is a brokensection; showing still another moditication.

lSo -far as we are aware the-majority oflv the spark plugs employed jfor igniting the gases in internal combustion -engines are vwhat --is commonly known as chambered Specification of Letters Patent.

elenie'nt coiledaround op .orfv the central elec,-

the soot or carbon, which-results, ,from the.

smoke of -theexplosion in-the enginercylinder, the said chaxnbers being sc .disposed' as to draw thca'r'bon away .rom--thespark- .ing points or terminals for preventingA short Application led December 26, 1918. Serial No. 808,697.

circuiting plugand the consequent :failure4 of the Our improvedspark plug is solid thro'ugh-v l out its length, which greatly simplies andV cheapens its construction and als'oaddatn 50.

The detailed `description of ouriinvenits life. f

tion follows: In the drawing, 2 represents the outer conducting shell or casing, which is bored but centrally and which is threaded at one end for attachment to the engine cylinder (not shown), while the other end"'isprevfer.

ably made hexagonal to receive a wrench for applying and removingthe plug.` g,

3 `representsa plurality'of electrodes Lor terminals,which are carried by, and pro-.4

ject from, the `threaded end of thesshell 2.

4 represents the central conductor',whicl1 comprises a rod or bar of steel orV other suitable conducting metal, One end of which is threaded at'5 for receivingnutsand 7;

8 represents a tubular insulating'pa'rt fills the bore of the shell 2, and insulates the l preferably mica, which surrounds the -rod- 4 4 intermediate amends, anawhichcompiaely sol shell fromv the rod 4. Thejlower end of* the rodnis /enlarged to provide a relatively rboad head 9, which su ports a number'of 1 electrodes or spark terminals 10, the eislbg which are positionednear lthe *free .ends of the electrodes 3, and at Wliclrzpoints' the sparking occurs. The end 9 of\the central conductor 4 is spaceda'conside'rable distance below the threaded end ofthe casing 2, and passes through an'enlarged insulating part"V 8', preferably cylindrical, and this partflfy comprise anextension of the tube 8.'

represents a similar mica' cylinder which encircles a ortion of the rod 4 beyond the opposite end.) ofthe` ell Vfrim the head 9 to the terminals of'elec .trodes l0.Y The current then jumps-thegaps v' between the electrode 10 and the electrodes i3, andcreatesthe spark which ignites theV charge-of gas in the engine cylinders, 'and lfromthe electrodes 3 the current asses Ain .the us ual way.

60 tween the coil and the head of the central To prevent the smoke which results from each explosion of the gas in the engine cyl inder from reaching the insulation 8', dis- -posed between .the head of -the conductor '9 and the casing 2, as well as the consequent gathering thereon of carbon, we provide a wire coil 15, preferably. comprising a metal` which will attract and stand a high temperature, such as nickel or nickel-steel, the said wire being coiled around the insulationS, as shown in Figs. l and 2. The coil is preferably substantially the length of the mica 8 and its upper end preferably rests .v ,y against the end of the casing 2, but the said 15 and for consuming or lburning up all smoke,

A the saidv parts.

- l In practice, when the engine is working,

oil or soot which approaches the portions of the plug which proJects below the casing 2.

The coil-heater is close'v enough to the electrode '3 to eiectuallyprevent, when heated up, any accumulation of smoke or soot on tll' temperature of 'the engine cylinder is A suiciently high to make the coil 15 redhot, .'and While in this condition all smoke, soot or oil :which touches the said coil, or the ine A. 'Vg sulation within the coil are instantly .con-

'3,51 i ning of the engine, lthere Iis no trace of car-4 sumed, so that after'long intervals of runbon or soot on either the coil or the sparking end of the plug.

The coil 15 may be secured in place around the insulation 8' in any suitable manner, but Awe prefer to attach the said coil by Ineansof a spiral groove. llwhich is formed in the said insulation, the coil being screwed in place like a nut, as best seen in Figs. 2 and 4.

Fig. 3 illustrates a modification, which consists of providinga cone shaped insulator 11 about which is disposed a bee-hive coil 15', which is held in place by a circumferential groove 16 (see Fi-g. '.7), preferably formed adjacent the casing 2 which receives the top convolution of the coil. 'lhe electrodes 3 in this view are shown bent so as to bring their free ends close to the ends of the. electrodes l10, and yet not contact with the said coil. The outer ends 17 and 17 of the coils 15 and 15 are preferably disposed' as shown in Figs. 5 and 6, at the farthest point from the ends of the electrode 10, so as to compel the sparking to take place at the ends of the wires 3 and 3', rather than beconductor, as' described.

Fig. 8 illustrates a slight modification of the coil 15, and consists of providing a tine 18, jvliidi is 'driven infn a hole in the lower -electrodes, of a central conductor vbetween the convolutions should not be less than one-thirty-second, nor greater than threethirty-seconds of an inch, if thesespaces are greater-or less than' described, carbon from Athe smoke andreek will gather on `the portion of the plug extending below the shell` 2,. and .interfere of the plug.

Having Y thus. described rlour. invention,

by Letters Patent; is-` .n

the -outer shell and a plurality of'electrodes projecting from one end of the'shelfL-of a central conductor passing through said shell,i one of its pro/lecting ends having a head. provlded w1th-a plurality of electrodes dis- Y posed so' as to provide narrow spark gaps between the corresponding electrodes ofthe shell, an insulating material separating said conductor from' said shell and surrounding the portion of the` conductor between said head andthe end of the shell, and a heating` coil wound around the said insulation between fsaidr head and, said shell and from all ofsaid electrodes.

2.V The combination of a solid-spark-plug comprising van outer and an inner conductor arranged concentrically, the outer conductor provided with depending electrodes, the `inner conductor having ahead spaced from the other conductor, which supports an elec trode the opposite ends of .which approach close to the firstelectrodes, an insulator separating said conductors and provided with a.

with the working .1. In a spark. plug, the combination with what we claim :is-.new anddesire to secure ver,

loo

spiral groove extending from said head to ward said outer conductor, and a smokeconsuming coil partially embedded in said groove and spaced from all of said electrodes.

3. In asolid spark-plug, the combination with the hollow shell carrying a plurality of through said shell, one end of said conductor having a head disposed between the free ends ofv the electrodes carried by said shell, an electrode .piercing said vhead at right angles tofsaid conductor, the opposite' ends of said electrode disposed adjacent the free ends of the first electrodes, an insulating material surrounding said conductor and separatingit from said shell, and a sniokeburning coil encircling the portionof said insulfation extending between said head and the adjacent end of said shell.

4. In a solid spark-plug for explosive ien gines, the combination with inner and outer conductors, .the inner conductor having head projecting beyond the outer conductor,

of an insulating material substantially surrounding the inner conductor and completely closing the bore of the outer conductor, terminals carried by the outer conductor and disposed parallel to said inner conductor, the free ends of said terminals disposed adjacent said head, spark-terminals carried by said head and approaching close to said first terminals, a coiled heating member coiled around the insulation extending between said head and the end of said outer In testimony whereof We aix own signa- 15 tures in presence of two witnesses.

NORMAN J. HoAG HENRY E. VosBURGn Witnesses:

HARRY DE WALLACE, GEORGE DE WALLACE.

Copies of this patent may be obtained for nve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

